Rotary pump



J. FRODSHAM.

ROTARY PUMP.

APPLICATION FILED APR.22, 1919.

1 ,329,895. Patented Feb. 3,1920.

INVENTOR Jb/an Frqdsham ATTORNEYS UNITED STATES PATENT OFFICE JOHN FRODSHAM, 0F BERKELEY, CALIFORNIA.

- ROTARY PUMP.

Specification of Letters Ilatent.

Patented Feb. 3,1920.

Application filed April 22, 1919. Serial No. 291,845.

tary pump, dated March 4, 1919, and bear ing the number 1,296,500.

It has been found in the operation of rotary pumps that there is considerable end thrust upon the vanes and the rotor of the pump and that there also is difliculty in operation, due to the fact that obstructing material passes through the inflow pipe and prevents the rotation ofthe. rotor, often breaking the vanes or bending the rotor shaft. It is the principal object of the present invention to provlde a pump of the character described, which is so constructed as to eliminate undesirable end thrust in the rotor and thevanes and at the same time to provide a pump structure which will prevent incoming material from obstructing the movement of the pump, thus preventing damage thereto.

The present invention contemplates the use'of'apump having a casing. the interior of which forms a cylindrical shaped chamber. Mounted within this chamber is a rotor carrying a plurality. of vanes extending radially within slots formed upon the opposite side of the rotor. In the present instance,the rotor is formed with a plurality of angular flanges which pass into circular grooves in the interior of the casing. These flanges'areformed through an eccen tric portion of the casing wall which causes the vanes to move inwardly during the operation of the pump, an eccentric cam being provided to automatically force the vanes outwardly as the pump continues to operate.

The invention is illustrated by way of eitample in the accompanying drawings, in which Figure 1 is-a view through the pump in central vertical section, disclosing the in-' take and outlet ports, the rotor therein and the cylinder circumscribed by said rotor.

Fig. 2 is a view in vertical section 'as taken on the line 22 of Fig. 1 and more clearly shows the formation of the rotor, the manner in which the vanes are operated,

and the slots in the eccentric portion of the casing. 1

Re errm more particularly to the drawings, 10 in icates a pump casing here shown as having a lower half 11 and an upper half 12. These casinghalves are intended to be bolted together by cap screws 13 which extend through flan es formed upon'the opposite side of the alves. The parting line of the casing is along a horizontal plane co-' inciding with the point of radius of the 7 lower wall of the casing, this wall being entirely concentric and also concentric wit the grooves which are formed in the upper casing half.

The upper casing half is formed with an inlet passageway 14 and/an outlet passageway 15. The inlet passageway extends'horizontally and tangentially to the chamber within the casing while the outlet passageway is shown as extending at an angle to the vertical and tangentially to the wall.

The outer. wall of the passage 15 is tangent to the inner wall of the casing while its opposite wall is shown to emanate from the point of intersection of the transverse center of the pump with the inner wall thereof. This arrangement will insure that large solid pieces flowing into the pump will be obstructed-as the incoming liquid strikes a vertical deflecting wall. also eliminates the possibility of binding the rotor by material as it passes out through pipe 17. Theopen ends of the passageways are internally threaded to receive an intake pipe 16 and an outlet pipe 17.

In order that the passageways may be satisfactorily cleaned when desired, removable plugs 18 are secured into the side walls of the casing and allow admittance to the interior of the casing and passageway. The upper "casing half is formed with an eccentric wall portion providing a plurality of cam members 19, 20. 21 and 22.

The eccentric walls of these members extend. from the dividing line of the casing halves and represent the reciprocal movementof the vanes of a rotor, afterward, to bereferred to. The cam portions 19 to 22 inclusive are spaced apart as shown in Fig.

2, to form a plurality of end thrust grooves 23, 24 and 25.. These grooves are rectangular in section and only extend the length of the cams themselves as the lower half of the casing is perfectly smooth and presents a full length bearing surface for the vane! The arrangement of the rotor. The opposite ends of the easing halves are closed by means of heads 26 and 27. These hea-dsare circular and-are bolted into osition by ca screws 28 and each of the eads is forme wlth asbearing 29 carrying a stuff box 30. The stuflbox is provided to receive a rotor shaft 31, which extends completely through the cylinder and provides a mounting for a circular rotor 32. V

The rotor 32 is mounted concentrlcally with the lower interior wall of'the casing vent end thrust on the rotor when it is in operation and thus hold it in a practically fixed path of travel preventing all binding against the opposite casing heads 26 and 27. The rotor is formed with a plurality of radial slots 34. These slots are here shown as being at right angles to each other. Each slot is fitted with a blade or vane 35 which may reciprocate along its slot and is designed to extend outwardly therefrom and to bear against the wall of the lower casing half and the eccentric face of the cam portions 19 to 22 inclusive. Inward reciprocal movement of each blade is, of course, produced by this eccentric face of the cam portions mentioned. The outward movement of the blade is positively produced by a pair of eccentric cams 36, one of which, is secured at each end of thecylinder and mounted upon the cylinder heads 26 and 27. By the provision of these cams, as particularly shown in Fig. 1, the space between the eccentric wall of cam portions 19-22and the cams 36 or the circular wall of the lower casing half and the cams will always be the same, this space being the width of the blade 35, thus holding the blade against any vibra-' tion. endwise while at the same time end thrust of the blade will be prevented by their bearing action upon the casing heads 26 and 27. v

In operation of the present invention a fluid under compression may be delivered to the pipe 16 when the deviceis to be used as a motor or may be allowed to flow through this pipe when the device is used as a pump.

en a pump actionv is provided, the flu1d will pass into the pipe 16 and will be 'deflected downwardly by striking the curved wall37 of the passageway 14. This downward deflection will act tothrow the fluid against the exposed-blade 35 of the rotor and will cause the rotor to operate in the direction of the arrow a, as indicated in Fig. 1. 'As the rotor is forced around on its cycle of travel, the fluid which has initial] entered through the pipe 16 will final y reach the outlet passageway 15 and be forced upwardly through the pipe 17. The forcin action of the vanes 34 will be gradually diminishedu on their upward movement, due to the fact that they will be retracted as they engage the eccentriceface of the cams 19 to 22 inclusive and when the blade has reached the upper edge 38 of thethe vertical wall 38. The inletwall will act to deflect any large pieces of solid material down into the large open portion of the casing, as it is formed between the casing wall and the outer circumference of the rotor.

When this material is delivered to the exhaust passageway 15, it will not be liable to struction atthis point, and the material will pass out through the pipe 17. I

It will be noted that the fluid will pass into the cylinder at a uniform rate. of flow and will be equally distributedover the surface of the rotor and between the flanges thereof. This will actto hold the rotor in balance while the fluid is being carried around the casing and delivered to the out-' let pipe 17. ,It will further be noted that the pump here shown is decidedly cheap to manufacture'and as it is formed of parts simple in their construction and readily assembled, will produce an article quite desirable for the trade, at the same time possess! ing the advantages of not being liable to become broken or rendered inoperative, due to obstruction in the pipe or to objectionable wear on the'bearings, or the ends of the rotor.

While I have shownthe preferred form of my invention as now known to me, it will be understood that various changes in the construction, combination and arrangement of parts may be made by those skilled in the art, without departing from the spirit of the inventionsas claimed. I

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. A rotary pump comprising a main. casing formed in two halves, the lower half of which provides a semi-cylindrical inner inner wall eccentric thereto and uniting with said lower wall to form a complete chamber, grooves having flanges formed along the eccentric upper wall and struck upon an arc concentric with the wall of the lower half, a rotor with engaging flanges mounted within the casin an concentric to the lower wall, a plura ity of vanes radially reciprocal within said rotor and adapted to continuously bear against the circular and eccentric walls and cam members against which the inner faces of the vanes rest and by'which the vanes are given outward reciprocating movements.

2. In a rotary ump, an outer casing, a chamber formed t erem, a rotor out of the said chamber, a plurality of flanges formed at intervals along said rotor, and rooves formed around the inner wall of sai chamber, and within which said flanges rotate to hold the rotor against longitudinal movement.

3. A rotary pump comprising a casing formed in two parts, the lower half having a concentric inner wall, the upper half having a wall eccentric thereto, the casing here carrying a rotor shaft eccentric to the upper wall, and concentric to the lower wall, a cylindrical rotor mounted upon said shaft, radial slots formed in said rotor, vanes reciprocable in said slots, cams carried upon the casing head and against which the inner faces of the vanes rest while holding the outer faces against the eccentric and concentric portions of the casing wall, a plurality of circular flanges formed along the length of the rotor, and grooves formed in the eccentric portion of the casing walls for the reception of said flanges and whereby end-thrust in the rotor will be obviated.

4. A rotary pump of the character described including a casing formed in two halves, the lower half of which has a semicylindrical inner wall and the upper half being formed with an inner wall eccentric thereto and uniting with said lower wall to form a complete chamber, rooves having flanges and formed with ra ii eccentric to the upper wall and struck upon an arc concentric with the wall of the lower half, a rotor with engaging flanges turnable within the casing and concentric with the lower wall, cams, the upper peripheries of which are concentric with the inner ends of the grooves, a plurality of vanes radially reciprocal with1n the rotor and bearing continuously against the circular and eccentric casing walls, and angularly disposed inlet and discharge passages, the outer walls of which are tangent to the inner periphery of the casing.

5. In a rotary pump of the character described, a casing with a smooth cylindrical lower half and a circumferentially channeled upper half eccentric to the lower half, a rotor with engaging flanges journaled axiall with the lower half and vanes slidable ra ially in the rotor and alternately into and out of the channels, an inlet passage to the casing having its outer wall tangent to the casing inner wall and its opposlte wall curved from the inlet assage, an outlet passage, the outer wall 0 which is tangential to the inner wall of the casing and its inner wall meeting the periphery of the rotor at the point where the vanes are withdrawn into it, and an abutment between the two passages.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JOHN FRODSHAM. Witnesses:

JOHN H. HERRING, W. W. HEALEY. 

